Revert "This implements per-isolate locking and unlocking, including tests"

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index af3a99a89facac121957020bbae355673cdc95d1..52c7145e2c79020ec70e7e58aa630fe4868e307f 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -224,7 +224,6 @@ class ThreadLocalTop BASE_EMBEDDED {
     ASSERT(try_catch_handler_address_ == NULL);
   }
 
-  Isolate* isolate_;
   // The context where the current execution method is created and for variable
   // lookups.
   Context* context_;
@@ -487,10 +486,6 @@ class Isolate {
   // Safe to call multiple times.
   static void EnsureDefaultIsolate();
 
-  // Find the PerThread for this particular (isolate, thread) combination
-  // If one does not yet exist, return null.
-  PerIsolateThreadData* FindPerThreadDataForThisThread();
-
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Get the debugger from the default isolate. Preinitializes the
   // default isolate if needed.
@@ -1070,7 +1065,7 @@ class Isolate {
   // If one does not yet exist, allocate a new one.
   PerIsolateThreadData* FindOrAllocatePerThreadDataForThisThread();
 
-// PreInits and returns a default isolate. Needed when a new thread tries
+  // PreInits and returns a default isolate. Needed when a new thread tries
   // to create a Locker for the first time (the lock itself is in the isolate).
   static Isolate* GetDefaultIsolateForLocking();
 
@@ -1202,12 +1197,9 @@ class Isolate {
 
   friend class ExecutionAccess;
   friend class IsolateInitializer;
-  friend class ThreadManager;
-  friend class StackGuard;
   friend class ThreadId;
   friend class v8::Isolate;
   friend class v8::Locker;
-  friend class v8::Unlocker;
 
   DISALLOW_COPY_AND_ASSIGN(Isolate);
 };